Draw a plane.

画一架飞机。

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You have seen that in the plane it is already pretty hard to draw a vector field.

正如大家所知，在平面中画出向量场已经很困难了。

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A general dynamically permissible velocity field for plane flow is set up in the paper. The force and energy parameters for extrusion (or drawing) are analyzed, and the optimum draw Angle is obtained.

本文建立了平面流动较为一般化的动可容速度场，分析了平面挤压(拉拔)的力能参数，获得了最佳凹模锥角。

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